Rear Diff Lube Change

Lima.Charlie · **Joined:** Sun Dec 27, 2009 11:02 am **Posts:** 374

This may sound weaird, but do you have to jack up the rear to change the lube? I know how to do everything else. I just was wondering if your putting up the rear for space to be able to work or what.

tommudd · **Posted:** Mon May 24, 2010 7:40 am

With it lifted you should not have to, I do mine without lifting it at all, actually do all of the fluid changes without lifting it.

Lima.Charlie · **Joined:** Sun Dec 27, 2009 11:02 am **Posts:** 374

Thats what I thought. For some reason when my fiance was asking me what I was planning on doing today and mentioned diff cover and a few other projects on the KJ, she asked about lifting it. I will never listen to her again....lol.

What oil should be used in the Rear diff?

TAHOE · **Posted:** Mon May 24, 2010 8:18 am

trobow wrote:

What lube goes in the rear?

I sooooo got to walk away from that one :goink:

Seriously Troy, most people use 75/80W90 for normal duty, heavy duty would be like 90W140. Just get a good synthetic in the lower weight you should be fine.

I never had to jack up my Tahoe to work under it....even when it wasn't lifted.... :goink:

BVCRD · **Posted:** Mon May 24, 2010 4:52 pm

Not required to jack it up lifted or not. I am stock height, and have no trouble. I went with a Felpro gasket this time instead of RTV. Used a tad to pre-glue it on the cover, but that is it.

JeepinJarhead03 · **Posted:** Mon May 24, 2010 5:09 pm

if for any reason you feel cramped, you can jack the body up to create a little more room, just make sure ya use jackstands or some other method

my lubelocker is currently on it's 3rd interval, no seeps or leaks so far

KJ 119 · **Posted:** Mon May 24, 2010 11:01 pm

Posted this once before and hope this is usefull.

A hippie down the street(dude with two old 70's vans),told me to jack up one side for about 45 minutes,then jack other side up for an hour to maximize drainage of old fluid.

infernicus · **Posted:** Mon May 24, 2010 11:27 pm

Not to thread jack, but I think it is relevant..
So they say;
normal duty 75/80W90
heavy duty 90W140

Does the differential fluid affect the MPGs?
Lets say I don't tow or do anything crazy to over work the truck, just A LOT of highway driving, would the heavier weight cause the MPGs to be lower?

JeepinJarhead03 · **Posted:** Mon May 24, 2010 11:29 pm

eh

beans add up

some say yes, and some don't pay attention lol

when you're dealin with a range of say 15 to 22mpg

well, lets put it this way, you won't simply drop from 25mpg to 18 just because you ran HD

and ya not going to go from 18 to 24 just by runnin street weight either

at 750ish for a rebuild it's worth it to use good juice, and the right juice for your use

infernicus · **Posted:** Mon May 24, 2010 11:39 pm

I put the HD, I figured it's better protection in the long run.
Maybe I'll put the lesser next time, just for fun.

67Customs · **Posted:** Thu May 27, 2010 10:29 pm

I use the hitch to lift the body up while the axle stays on the ground. This gives some extra room to work with.

I use Mobil 1 75w-140.

GeekyJeep · **Posted:** Thu May 27, 2010 10:44 pm

for my rear i had to lift it to get the fluid in.. but if id had a piece of pvc tube to put over the nozzle on the bottle i d have been able to do it on the ground.

mag03kj · **Posted:** Thu May 27, 2010 11:12 pm

How many qts. do the rear of the KJ hold! I need to do mine but i dont know how much it holds!

Rear Diff Lube Change

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